add field/setters to conn tracker

Signed-off-by: Benjamin Kilimnik <bkilimnik@pixielabs.ai>

Author: benkilimnik

src/stirling/source_connectors/socket_tracer/conn_tracker.h

@@ -68,6 +68,7 @@ struct SocketOpen {
   uint64_t timestamp_ns = 0;
   // TODO(yzhao): Consider using std::optional to indicate the address has not been initialized.
   SockAddr remote_addr;
+  SockAddr local_addr;
 };
 
 struct SocketClose {
@@ -336,6 +337,11 @@ class ConnTracker : NotCopyMoveable {
    */
   const SockAddr& remote_endpoint() const { return open_info_.remote_addr; }
 
+  /**
+   * Get local IP endpoint of the connection.
+   */
+  const SockAddr& local_endpoint() const { return open_info_.local_addr; }
+
   /**
    * Get the connection information (e.g. remote IP, port, PID, etc.) for this connection.
    */
@@ -577,6 +583,7 @@ class ConnTracker : NotCopyMoveable {
   void SetConnID(struct conn_id_t conn_id);
 
   void SetRemoteAddr(const union sockaddr_t addr, std::string_view reason);
+  void SetLocalAddr(const union sockaddr_t addr, std::string_view reason);
 
   // Returns false if the protocol change is disallowed.
   bool SetProtocol(traffic_protocol_t protocol, std::string_view reason);
@@ -799,6 +806,8 @@ std::string DebugString(const ConnTracker& c, std::string_view prefix) {
   info += absl::Substitute("state=$0\n", magic_enum::enum_name(c.state()));
   info += absl::Substitute("$0remote_addr=$1:$2\n", prefix, c.remote_endpoint().AddrStr(),
                            c.remote_endpoint().port());
+  info += absl::Substitute("$0remote_addr=$1:$2\n", prefix, c.local_endpoint().AddrStr(),
+                           c.local_endpoint().port());
   info += absl::Substitute("$0protocol=$1\n", prefix, magic_enum::enum_name(c.protocol()));
   if constexpr (std::is_same_v<TFrameType, protocols::http2::Stream>) {
     info += c.http2_client_streams_.DebugString(absl::StrCat(prefix, "  "));